$\prod _{name} (\sigma _{grade=A}(Student * Grade))$
$(Student * Grade))$
Student * Grade
Name |
Roll No |
G.Roll no |
Grade |
A |
1 |
2 |
A |
A |
1 |
3 |
B |
A |
1 |
4 |
A |
B |
2 |
2 |
A |
B |
2 |
3 |
B |
B |
2 |
4 |
A |
C |
3 |
2 |
A |
C |
3 |
3 |
B |
C |
3 |
4 |
A |
$(\sigma _{grade=A}(Student * Grade))$
Name |
Student.Roll No |
Grade.Roll no |
Grade |
A |
1 |
2 |
A |
A |
1 |
4 |
A |
B |
2 |
2 |
A |
B |
2 |
4 |
A |
C |
3 |
2 |
A |
C |
3 |
4 |
A
|